Improvement in steam-pumps



2 Sheets-Sheet 1.

G. F. BLAKE. STEAM PUMP.

No. 108,554. Patented Oct. 25,1870.

z verz fa r.

G. I'. BLAKE. STEAM PUMP.

No. 108,554. i Patented Oct. 25, 1870.

2 Sheets-Sheet 2'.

identit ,States GEORGE FBLAKE, BOSTON, MASSACHUSETTS.

Letters Patent No. 108,554, dated October 25, 1870 antedated October 20,1870.

IMPROVEMENT IN STEAM-PUMPS.

The Schedule referred to in these Letters Patent and making part of the vsame.

To all whom i t may concerny Be it known that l, GEORGE F. BLAKE, ot" Boston, in the county of S'uiolk and State of Massachusetts, have invented certain new and useful Improvements in Steam-Pumps; and I do hereby declare the following to be a full and correct description of thc same., reference being had to the. accompanying drawings, iu which y Figure 1 is a perspective view of' my improved pump complete.

Figure 2 is a side view of the steam-cylinder and adjacent parts, with thc plato which covers the stcainchest removed.

Figure 3 is a transverse vertical section on the line :c of' fig. 2.

Figures si, 5, and 6, are, respectively, top, side, and bottom views of the slide-valve.

Figures 7 and b are views of the two halvesl of thc tappct-arm in differentpositions,

Figure 9 is a transverse vertical section on line ,1/ 1/ ofg. 2.

Figure 'l0 is a vertical longitudinal central section looking toward the exhaust side ot' thc pump.

Figure 11 is a vertical longitudinal central section looking toward the inlet side ot' the pump.

Figure' 12 is a transverse section of' the hollow plunger. f

Figure i is a longitudinal section of the saine; and

Figures 14 and 15 are views illustrating the construction of the tappct-nuts aml the inode of their attachment .to the tappet-rod.

The same letter indicates the same partwherever it occurs.

The nature ot' this invention consists in improve ments in the steam-pump, haviuir for their object and result- First, to secure, by a double method ot' exhaust, a very rapid discharge ot' the steam after doing its work, thereby preventing the pounding ot' the cylinderheads, so apt to occur when ruiming at high speed, and also relieving the steam-cylinder from back pressure.

Second, to prevent leakage between the port-s and diminishthe wear of the working parts. p

Third, to improve the construction and attachment of the tappct-arm, and ot' the parts connected therewith, all as hereinafter more particularly set forth.

To enable others skilled iu the art to make and use my improved steam-pump I will proceed to dcscribe its construction and operation, referring to the accompanying drawings hy the figures and letters of reference marked thereonl The general form and arrangement of thc pump is clearly shown in iig. 1, which rrepresents the inlet side.

C marks the steam-cylinder, which is of usual form, and is cast in one piece with the plungencylinder C', which surmounts it, all the ports and passages between them being embraced in the same casting.

This method of construction obviates the necessity ot joints, and, therefore, prevents leakage of steam between the ports.

y l) is a plate or bonnet, which covers the steamchest M, and is attached thereto by the bolts or screws s.

The inlet-pipe I connects the steam-chest with theboiler.

On removing .thc plate D we lay open the steamohest M, iu which slides the slide-valveV, the details of the form of which are shown clearly in tigs.'4, 5, and (5.

This valve is introduced into or removed from the steam-chcst by taking ofi' plate D wit-hout disturbing any other part. The steam enters under the middle of the valve, and passes into the steam-chest around it.

' This valve is attached to thc tappct-rodR, by its head yr, which enters a recess in the face of the valve.

It has two cups, y c, which serve to connect port-s in the ordinary way. i

The ribs /r r2, on the back of the valve, confine it to its seat, and the rod frn limit-s its rearward motion. The function ot'l this valve is to control?. the course of the steam in its supply to the steam and plunger-cylinders, as hereinafter described.

The inmoval of the valve V discloses the valvescatVQViig. 2, with its eight ports a b c d e f g 7i., of which a and h lead, respectively, to the rear and front ends of the phulgcr-cylimier O', and b c (Z c fg lead, respectively, to the port-s .in the plungerfcylimler, marked, in figs.v lOand 11, l1' c' d"c f' g.

The ports l1 and g communioatejwith the openings t and L', leading to the exhaustechamber L, on the opposite side ot' the cylinder' to the piate D.

d d' and c c are the inlet-ports;` b b'and g g are exhaust-ports; and f f' and c c' are ports leading -to the passages j lmi, which conduct steam to either end oi` the steam-cylinder;

In the cylinder C is a hollow plungcr-valve, H, which is driven by steam, as l'iereinafter described, and regulates the supply and exhaust of the steamcylinder O, by means ofthe six ports on its seat, b' e' d c' j" g', which correspond with the six ports on valve-scat V, marked'b c d c f g. The form ot this -plunger is clearly shown in figs. l0, 12, and 13. It is hollow from end ,to end, as shownl in the last-nan1ed figure, and has two openings in the lower portion, which serve to carry steam from port to port.

Two spring rings XV iV, serve as packing to keep the plunger in its seat, and to prevent leakage between the ports.

These spring rings are less than thev whole circumference ol' the plunger', by the Width of the lower openings, and they are set ont or drawn in by means ot' the curved arm Y,.regulated bythe set-screw@ '.lheir length being sue-h as not to cncroaeh upon the lower openings in the plunger, they Aallow the plunger to pass over the ports wit-hout injury to them'or to the spring rings.

The plungcr-cylimler C', as before observed, is cast in one piece with thc steam-cylinder.

The plunger H has a reciprocating motion in this cylinder, being driven by steam admitted tln-imgh passage-iva-ys a' and h1, figs. .fand 10.

The openings of these ways on the inside of the cylinder-heads, are covered by spring valves r, (see iig. 10,) which open inward.

Short passages ci and h2 connect the interior of (1', near its ends, with the passages h u?, as shown. The object of this arrangement is to form a steam-cushion, l'or the ends ol' the cylinder, -aller passing the upper orifices of passages al h2. i l

.lhe plunger ll is driven by the steam alternately taken and exhausted by cylinder C', through the passages h rt, leading respectively-to ports a and h, under the valve iig. 2. Those ports eonnmf-t. :diernately with the exhaust-ports b and g.

.llunger ll` is kept from turning on its longitudinal axis by a lguide-rod, 1r, iig. l0, passing through the upper cylinder-heini, into-a' hole, .1', in the plunger, (see figs. 10,112, and 13.)

The sieai11-cyli1uler (l is connected with the supply and exhaust-fporis b v the passages j and m, in the usual manner. i

The steam-piston .I is o t' usual l'orm, and is connected to thc pump-piston l\, by the piston-rod 1.

To this `:rod the iuppctfarmT is attached, which operates the tappet-lod It, from' which the slide-valve receives its` motion.

The tappet-arm is. malle in halves, as shown in igs. 7 and S, united together by screws passed through the holes p p.

('irooves 1,in the upper end ot' these halves, receive and clamp the tappet-rod lt. The piston-rod is also held in rthe same 4way by a pair o1` semieircular grooves in the lower end of the arm.

.f\ set-screw, S', passes through the tappet-arm into :t recess cut in the. pistou-rod 1 -i'o receive it, and hold the arm in a lixed posit-ion. t

'the upper end ot tappeti-arm -T operates the tappet-rod by striking alternately two adjustable nuts or bumpers, attached to the rod by set-screws 'lhe'se nuts are seen in enlarged view in I'igs. .It and 15, which illust-raie their construction and modeoi' atlae-lunent to the tappet-rod lt.

l'laeh nut has a cup on that side ou which it receives the blow olfthetappet-arm, and in that cup is placed a ring ot' lent-hear, to break the shock of the hlow. .lhese rings, heilig supported bythe sides ot the cup, are noiso rapidly pounded out and destroyed.

',lhe set-screws s enable the nuts to b'- :ldjusted to any desired position on the tappet-rod.

'.lhel pump is supported on the I'eetl and the steam and pulop-cylinders are united bythe trough A.

An oil-wup, (l, provides |`or the lubrication oil the plunger.

l.`he exhaust-chamber l, is covered by a plate, U, and is romweled with the open nir b v the exhausts pipe lf..

`valve at that end closes, and-the exhaust takes the pounding ofgthe plunger.

Operation.

The operation is as'follo'ws:

Steam being admitted through inlet-pipe 1l into the steam-chest, operates the plunger-valve H, by being alternatelyadmitted through ports t h to the pas- Sages al h, through which also the exhaust from the `cylinder O" alternately takes piace, the ports a h bcing alternately connected by valve vii/ith the exhaustports b g.

In passing into the cylinder C', the steam opens the spring valve fr', which covers the ports at the upper ends of the passages a," h1. As thefplunger H approaches either end oi the cylinder C', the spring place through one of the branch passages a h2.

When theplunger has. approached so near the cylinder-lL/.atll as to'cove-r either 0f the'ports h', the space between thecovered port andthe cylinder-head remains full of steam, affording acushion to prevent The arrangement of the ports inthe top valve-seat is such that a double exhaust from the steam-cylindei-Hisati'orded, when the plunger is at either end of its stroke.

ln fig. l() the plunger H is represented as midway in its stroke.. lt' itavere' moved toward vthe rear end of the cylinder l'ar enough to uncover ports c' and f', lthe stema-cyl.' ider would then take steam through ports d' e', and exhaustthrough ports f y', but the exhaust steam would not only escape through passage it into theexhaust-chamber, but passing through the hollow plunger H, would tlow through port b and passage li. intothe exhaustfclnunber. If, on thc contrary, the plunger were moved toward the forward end ot` thccyl-inder C' fitr enough to uncovexy ports c and j", thel steam-cylinder would take steam through c and f,j and exhaust through c and i, and also tlJlOllgil y' mld passing@ 7|', the steampassing through the plunger from b to g. v

The advantage of this arrangement is the rapid discharge ot' steam after it has performed its work, thereby avoiding the pounding ofthe cylinder-heads when running at high speed, and also any back pressure in the steam-cylimler.

Having thus fully described my invention,

v\Vhat l claim, and desire tosecurc by Letters Patent, is- Y ll. 'lhe described arrangement of ports, in combination with 'a hollow valve or plunger, by which exhaust steam can bc discharged, by the. operation of one valve, from two port-s at thc'saule time, as set forth. f. 2. 'lhe hollow plungervalve, constructedas set forth.

o. vThe, spring packing-ring Iu', constructed and ar- -ranged as described.

l. The tappet-arm T, constructed inhaivcs, and

v arranged as described.

5. The recess or cupin the tappet-nuts, construct-ed and arranged as set forth.

The above specitication of my'said invention signed and witnessed at Boston, this Sth day of March, A. 1).- f

GEO. F. BLAKE.

Witnesses:

' B. E. PERRY,

l). G. lHoMrsoN. 

